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How To Access Code In Large w/ Vim

C
Cheng Hsien Chen

The document discusses the challenges faced in navigating a large codebase exceeding a million lines, particularly related to camera ISP mechanisms and non-standard implementations. It highlights difficulties in code tracing, communication, deployment, and tooling enhancements to improve the efficiency of developers' workflow. Proposed solutions include improved command functions for directory navigation, a gtags integration for symbol searching, and additional Vim plugins to optimize code interaction.

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HOW TO ACCESS THE CODE 
 IN LARGE CODEBASE WITH VIM Edgar Wang & Howard Chung & Ferry Chen Titan Camera Team, 2014-2015
MILLION LINES OF CODE!! External camera ISP use non-standard solution provided by QCOM non-streaming output for still image capturing External ISP wrapped asYUV sensor wrappedYUV sensor not in QCOM expectations YUV sensor with META!!! REALLY?
MILLION LINES OF CODE!! external ISP not provide CCI compatible commands external ISP use SPI to download the firmware, SPI is not a part of cameraV4L2 driver framework.. DOUBLE WHAMMY !!
MILLION LINES OF CODE!! many features requested need the changes cross all layers from APP to ISP, and the non-standard solution here make THE WORST… QCOM CANNOT support us with its PREPARATORY code…
MILLION LINES OF CODE!! HOW MUCH?
MILLION LINES OF CODE!! PATH LOC FRAMEWORKS/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA.JAVA 1897 FRAMEWORK/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA2/* 15099 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA.CPP 1021 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA2_* 2923 FRAMEWORKS/AV/SERVICES/CAMERA/LIBCAMERASERVICE/* 19940 FRAMEWORKS/AV/CAMERA/* 5492 HARDWARE/QCOM/CAMERA/* 103386 VENDOR/QCOM/PROPRIETARY/MM-CAMERA/* 816521 KERNEL/DRIVERS/MEDIA/PLATFORM/MSM/CAMERA_V2/* 51954 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-CAMERA.DTSI 517 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-TITAN-CAMERA.DTSI 0 SUM 1018750 1,000,000+ Lines of Code (exclude the comments)
MILLION LINES OF CODE!! PATH #OFCHG FRAMEWORKS/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA.JAVA 114 FRAMEWORK/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA2/* 1544 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA.CPP 4 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA2_* 153 FRAMEWORKS/AV/SERVICES/CAMERA/LIBCAMERASERVICE/* 329 FRAMEWORKS/AV/CAMERA/* 0 HARDWARE/QCOM/CAMERA/* 11059 VENDOR/QCOM/PROPRIETARY/MM-CAMERA/* 22120 KERNEL/DRIVERS/MEDIA/PLATFORM/MSM/CAMERA_V2/* 7271 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-CAMERA.DTSI 4 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-TITAN-CAMERA.DTSI 110 SUM 42708 4.2%,42078 linechanged by Camera Team
CHALLENGES Code Tracing Features Implementation Baseline Porting Human Communication Change submission
CHALLENGES - DETAILS Call Path too long to trace Feature’s implementation not only in 1 or 2 projects only Porting - be the a real F! thing. Hardly to talk with other guys in code level. High missing rate with submission Slow disk search model complexities etc……
DISLIKED Exhausted code searching, this take lots of time to do it and degrade our performance! e.g. grep, find, egrep…etc Unnecessary directly switchings, redundant works and easy to lost in codebase e.g. cd ../../../../../ && cd <path_to_hal> No links between caller/callee for constants and functions This will be a nightmare when tracing the call with tens of hops Dupe and repeated works This real be a hated one when you do thousands of changes!! Slow deployment process Flashing system takes 6 mins; push tons of libraries also take tens of seconds and error-prone. Code editor only support one PL well We are in Java/C++/C mixed codebase.
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
THE START POINT… Alfred Huang (ajch), early camera BSP Owner Switching directories really a bullshit! History commands not straightforward to use Vi is good to edit, but not good to do code tracing
THE START POINT… We must (by ajch) more powerful cd command reuse and recall command history with ease enableVi have full capability to do code tracing
ESSENTIAL COMMANDS ecd - extended cd the memo list of working directories support quick switch between working directories ease of list modification sorting on memo list
ESSENTIAL COMMANDS Usage For any working directory, using following command to push it into list Whenever your want to jump a recorded directory, get the idx for jumping first And you can jump to the directory by ~ $ ecd . ~ $ ecd -l ~ $ ecd -<Number>
ESSENTIAL COMMANDS ~ $ ecd -l 0) /home/cm/workspaces/Edgar/V06_1260/LINUX/android 1) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/kernel/drivers/media/platform/msm/camera_v2 2) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/vendor/qcom/proprietary/mm-camera-titan 3) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/hardware/qcom/camera_titan 4) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/vendor/qcom/proprietary/mm-still 5) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android 6) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android/hardware/qcom/camera_titan 7) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android/vendor/qcom/proprietary ~ $ ecd -7
ESSENTIAL COMMANDS hist - sort out cached history in shell and .bash_history provide a visible view with command history in both memory and .bash_history not broken the bash’s command history but extend it compatible to the exclamation mark (!) in bash
ESSENTIAL COMMANDS Usage For any working directory, using following command to push it into list just pass the number after exclamation mark ~ $ hist|grep <keyword> ~ $ !<Number>
ESSENTIAL COMMANDS ~ $ hist|grep fastboot
 220) adb shell logcat -v threadtime > ./log.txt 314) adb reboot bootloader && fastboot -i 0x27F1 flash boot /Volumes/Sanctuary/Ferry/V06_1260/LINUX/ android/out/target/product/v06/boot.img && fastboot -i 0x27F1 flash system /Volumes/Sanctuary/Ferry/ V06_1260/LINUX/android/out/target/product/v06/system.img && xfastflash reboot 317) adb shell setprop log.tag.ImageReaderTest VERBOSE 320) adb pull /storage/emulated/0/3840x2160_full_jpeg.jpg 321) adb pull /storage/emulated/0/3840x2160_full_yuv.jpg 368) adb shell logcat -v threadtime|grep "left =" ~ $ !314
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
GTAGS - GNU GLOBAL source code tagging system support 6 PLs by default, 25 PLs with Exuberant Ctags plug-in parser. Java/C/C++ are default ones. Support shell command line,Vi, Emacs Performance! support text pattern …etc https://www.gnu.org/software/global/ for details… GET SYMBOLS IN A SECOND
GET SYMBOLS IN A SECOND Preparation Download Install gtags make and install ~ $ wget http://tamacom.com/global/global-6.5.1.tar.gz ~ $ tar zxvf global-6.5.1.tar.gz && cd global-6.5.1 ~ $ ./configure && make && mkaeinstall
GET SYMBOLS IN A SECOND Use gtags for Android codebase switch to Android source tree generate list of file to be indexed (optional) android_src $ find . ( ! -path "./out*" -a ! -name ".git*" ) -a ( - name "*.cpp" -o -name "*.h" -o -name "*.c" -o -name "*.aidl" -o - name "*.java" -o -name "*.S" ) > somefile ~ user$ cd <Android_source_tree>
GET SYMBOLS IN A SECOND Index tags for Android codebase Index the source tree Update the source tree (when needed) android_src $ gtags -f somefile android_src $ global -uv
GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query a symbol android_src $ global PowerManagerService frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query a symbol, have more info android_src $ global -x PowerManagerService PowerManagerService 102 ../../../../../frameworks/base/services/core/java/com/android/ server/power/PowerManagerService.java public final class PowerManagerService extends SystemService
GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query WHO use a symbol android_src $ global -r PowerManagerService frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java frameworks/base/services/java/com/android/server/SystemServer.java
GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query WHO use a symbol, with more info android_src $ global -rx PowerManagerService PowerManagerService 2998 frameworks/base/services/core/java/com/android/server/power/ PowerManagerService.java PowerManagerService.this.handleWakeLockDeath(this); PowerManagerService 53 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java import com.android.server.power.PowerManagerService; PowerManagerService 622 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java PowerManagerService.lowLevelReboot(reason); PowerManagerService 644 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java PowerManagerService.lowLevelShutdown(); …
GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query symbol support patterns (regular expression!) android_src $ global PowerManager* cts/tests/tests/os/src/android/os/cts/PowerManagerTest.java cts/tests/tests/os/src/android/os/cts/PowerManager_WakeLockTest.java … Caution! This takes minutes! But still much faster than search full codebase..
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
Vim/Vi - native supports on tabs NerdTree - explore filesystem and to open files and directories forVi/Vim Tagbar - list symbols of current file forVi/Vim This depends on Exuberant ctags TABBED EDITOR WITH FS NAVIGATOR AND LIST OF SYMBOLS android_src $ sudo apt-get install exuberant-ctags Linux android_src $ brew install exuberant-ctags Mac
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
GTAGS - GNU GLOBAL source code tagging system Although gtags support much editors, but it is not good enough! Only jump to symbol(callee) supported by gtags… TRIVIAL WAYTOTRACE SYMBOLS
TRIVIAL WAYTOTRACE SYMBOLS
ajch’s gtags.vim - Alfred’s gtags plugin formVi/Vim we’re all vimers!! support get the list callers of symbols! the last pulse of code tracing! TRIVIAL WAYTOTRACE SYMBOLS
TRIVIAL WAYTOTRACE SYMBOLS Having list of caller and callee is not enough We must have next page/prev page function too.
ajch’s mym.vim - stack behaviours of the gtags operations onVi/Vim Hooray! we’re all vimers!! support next page/prev page operations makesVi/Vim be a browser like editor! Alfred’s plugins are integrated to ourVimSuite - later on.. TRIVIAL WAYTOTRACE SYMBOLS
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
QFEnter - A vim plugin for intuitive file opening from Quickfix window to tabs THE EDITOR CAN SUPPORT QUERIES ON SYMBOLS WITHTABS
vim-bookmarks - A vim plugin for bookmark support line based bookmark support bookmark annotations ease of use integrated to quick fix window … THE EDITOR WILL BE NICE IF IT HAS BOOKMARK ABILITIES
EHFANDROIDVIMSUITE F2 - open/close/update bookmark F7 F8 F5 - next tab F6 - prev tab t
EHFANDROIDVIMSUITE F3 - list of defines F4 - list of references
WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
It is not enough It can be better
WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
xvim - put you to the symbol withVi/Vim directly based on gtags. ease of use list all candidates to choose first great partner to debug with logs!!!! RANDOM ACCESSTO CODEBASE
RANDOM ACCESSTO CODEBASE 10-09 08:46:54.239 7427 7427 E mm-camera: mct: mct_pipeline_stop_session - E 10-09 08:46:54.240 7427 7427 E mm-camera: mct: mct_pipeline_process_set:command=800000b 10-09 08:46:54.240 7427 7427 E mm-camera: mct: mct_pipeline_process_set: Issuing DEL_STREAM on stream 0x1000f and stream type=10 10-09 08:46:54.240 7427 7427 I mm-camera-sensor: port_sensor_unlink_func:293ide 1000f 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_ext_unlink_func: E, identity = 0x1000f, port = 0xf4878e20, direction = 2 10-09 08:46:54.240 7427 7427 I mm-camera-sensor: port_sensor_caps_unreserve:204ide 1000f 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_check_caps_unreserve_func: E, identity = 0x1000f, port = 0xf4878e20, direction = 2 10-09 08:46:54.240 7427 7427 E mm-camera: iface_unreserve_sink_port: stream_id f mode 0 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_ext_unlink_func: E, identity = 0x1000f, port = 0xf4bbc160, direction = 1 10-09 08:46:54.240 7427 7427 E mm-camera: iface_ext_unlink_src_port: mct stream already removed from hw stream
RANDOM ACCESSTO CODEBASE java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787) at java.util.HashMap$EntryIterator.next(HashMap.java:824) at java.util.HashMap$EntryIterator.next(HashMap.java:822) at com.android.internal.telephony.SubscriptionController.getPhoneId(SubscriptionController.java:1199) at com.android.phone.PhoneInterfaceManager.getPhone(PhoneInterfaceManager.java:789) at com.android.phone.PhoneInterfaceManager.getIccId(PhoneInterfaceManager.java:2161) at com.android.phone.PhoneInterfaceManager.getLine1NumberForDisplay(PhoneInterfaceManager.java:2205) …
drop you to the symbol directly! RANDOM ACCESSTO CODEBASE android_src $ xvim <symbol_name> android_src $ xvim port_iface_check_caps_unreserve_func Example android_src $ xvim getPhoneId
RANDOM ACCESSTO CODEBASE android_src $ xvim getPhoneId
 1) frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/MSimSignalClusterView.java: 378 2) frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/ MSimNetworkControllerImpl.java:280 3) frameworks/base/telephony/java/android/telephony/RadioAccessFamily.java:75 4) frameworks/base/telephony/java/android/telephony/SubscriptionManager.java:828 5) frameworks/opt/telephony/src/java/com/android/internal/telephony/Phone.java:1999 6) frameworks/opt/telephony/src/java/com/android/internal/telephony/PhoneBase.java:2203 7) frameworks/opt/telephony/src/java/com/android/internal/telephony/PhoneProxy.java:1470 8) frameworks/opt/telephony/src/java/com/android/internal/telephony/ServiceStateTracker.java:1101 9) frameworks/opt/telephony/src/java/com/android/internal/telephony/SubscriptionController.java:1169 … #?
WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
The problem… comments for jira header/footer really a bullshit when code changes in 4+ files… comments for jira header/footer, this is penalty to RD, it discourage RD to do changes to solve the problem! DUPE AND REPEATED WORKS CAN BE MAXIMUM ELIMINATED
git xcommit - unlock you from jira comment blocks.. auto comment jira header/fooder surround changed code block interactive way to input jira info for git-commits. auto list changed files for git add and commit msg. DUPE AND REPEATED WORKS CAN BE MAXIMUM ELIMINATED
PREFERRED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
The problem…. DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ mm project_XX $ cd ../../../../../../out/target/prodcut/V99 V99 $ adb push system/…. /system/…. V99 $ cd - project_XX $ mm
reinstallSomething.py auto delivery .apk, .so, .xml, executable binaries to device with give name support pattern search accurate, reliable, and support both local and remote repositories DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION
DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ mm … Install: out/target/product/v06/system/lib/hw/camera.msm8994.so … Install: out/target/product/v06/system/lib/libmmcamera_interface.so … Install: out/target/product/v06/system/lib/libmm-qcamera.so ….. ….. project_XX $ adb root project_XX $ adb remount project_XX $ reinstallSomething.py -i camera.msm8994.so libmmcamera_interface.so libmm-qcamera.so project_XX$ adb reboot
pattern support Support remote repository DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ reinstallSomething.py -i libmmcamera* local_dir $ export OUT_OVERLAY=/Volumes/Sanctuary/Ferry/V06_1260/LINUX/android/out/target/ product/v06 local_dir $ reinstallSomething.py -I libmmcamera* local_dir $ adb reboot
WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
Problem.. the patch is good… but sometimes not applicable how to have full picture of changes how to deliver the change to other guys with full contexts … A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS
git xcommit -backup This command will backup modified things (note, new added one must be separately handled, doesn’t a matter) A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS folder_to_backup $ git xcommit -backup
A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS
PREFERRED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
xfastboot, xadb… when multiple connected to host…… MORE & MORE… user $ xadb shell more than 1 devices, choose 1 device: 1) V06001325 2) V06000136 3) V06001835 4) V06000137 #? 1 V06001325 root@v06:/ #
LINKS https://github.com/ferrisky/EHFAndroidVimSuite https://github.com/ferrisky/ecd https://github.com/ferrisky/hist https://github.com/xygod/Git_X_Commit https://github.com/xygod/Gtags_X_Vim https://github.com/xygod/reinstallSomething
WELCOME TO CONTRIBUTE CODES TO US!

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How To Access Code In Large w/ Vim

  • 1. HOW TO ACCESS THE CODE 
 IN LARGE CODEBASE WITH VIM Edgar Wang & Howard Chung & Ferry Chen Titan Camera Team, 2014-2015
  • 2. MILLION LINES OF CODE!! External camera ISP use non-standard solution provided by QCOM non-streaming output for still image capturing External ISP wrapped asYUV sensor wrappedYUV sensor not in QCOM expectations YUV sensor with META!!! REALLY?
  • 3. MILLION LINES OF CODE!! external ISP not provide CCI compatible commands external ISP use SPI to download the firmware, SPI is not a part of cameraV4L2 driver framework.. DOUBLE WHAMMY !!
  • 4. MILLION LINES OF CODE!! many features requested need the changes cross all layers from APP to ISP, and the non-standard solution here make THE WORST… QCOM CANNOT support us with its PREPARATORY code…
  • 5. MILLION LINES OF CODE!! HOW MUCH?
  • 6. MILLION LINES OF CODE!! PATH LOC FRAMEWORKS/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA.JAVA 1897 FRAMEWORK/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA2/* 15099 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA.CPP 1021 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA2_* 2923 FRAMEWORKS/AV/SERVICES/CAMERA/LIBCAMERASERVICE/* 19940 FRAMEWORKS/AV/CAMERA/* 5492 HARDWARE/QCOM/CAMERA/* 103386 VENDOR/QCOM/PROPRIETARY/MM-CAMERA/* 816521 KERNEL/DRIVERS/MEDIA/PLATFORM/MSM/CAMERA_V2/* 51954 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-CAMERA.DTSI 517 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-TITAN-CAMERA.DTSI 0 SUM 1018750 1,000,000+ Lines of Code (exclude the comments)
  • 7. MILLION LINES OF CODE!! PATH #OFCHG FRAMEWORKS/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA.JAVA 114 FRAMEWORK/BASE/CORE/JAVA/ANDROID/HARDWARE/CAMERA2/* 1544 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA.CPP 4 FRAMEWORKS/BASE/CORE/JNI/ANDROID_HARDWARE_CAMERA2_* 153 FRAMEWORKS/AV/SERVICES/CAMERA/LIBCAMERASERVICE/* 329 FRAMEWORKS/AV/CAMERA/* 0 HARDWARE/QCOM/CAMERA/* 11059 VENDOR/QCOM/PROPRIETARY/MM-CAMERA/* 22120 KERNEL/DRIVERS/MEDIA/PLATFORM/MSM/CAMERA_V2/* 7271 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-CAMERA.DTSI 4 KERNEL/ARCH/ARM64/BOOT/DTS/QCOM/MSM8994-TITAN-CAMERA.DTSI 110 SUM 42708 4.2%,42078 linechanged by Camera Team
  • 8. CHALLENGES Code Tracing Features Implementation Baseline Porting Human Communication Change submission
  • 9. CHALLENGES - DETAILS Call Path too long to trace Feature’s implementation not only in 1 or 2 projects only Porting - be the a real F! thing. Hardly to talk with other guys in code level. High missing rate with submission Slow disk search model complexities etc……
  • 10. DISLIKED Exhausted code searching, this take lots of time to do it and degrade our performance! e.g. grep, find, egrep…etc Unnecessary directly switchings, redundant works and easy to lost in codebase e.g. cd ../../../../../ && cd <path_to_hal> No links between caller/callee for constants and functions This will be a nightmare when tracing the call with tens of hops Dupe and repeated works This real be a hated one when you do thousands of changes!! Slow deployment process Flashing system takes 6 mins; push tons of libraries also take tens of seconds and error-prone. Code editor only support one PL well We are in Java/C++/C mixed codebase.
  • 11. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 12. THE START POINT… Alfred Huang (ajch), early camera BSP Owner Switching directories really a bullshit! History commands not straightforward to use Vi is good to edit, but not good to do code tracing
  • 13. THE START POINT… We must (by ajch) more powerful cd command reuse and recall command history with ease enableVi have full capability to do code tracing
  • 14. ESSENTIAL COMMANDS ecd - extended cd the memo list of working directories support quick switch between working directories ease of list modification sorting on memo list
  • 15. ESSENTIAL COMMANDS Usage For any working directory, using following command to push it into list Whenever your want to jump a recorded directory, get the idx for jumping first And you can jump to the directory by ~ $ ecd . ~ $ ecd -l ~ $ ecd -<Number>
  • 16. ESSENTIAL COMMANDS ~ $ ecd -l 0) /home/cm/workspaces/Edgar/V06_1260/LINUX/android 1) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/kernel/drivers/media/platform/msm/camera_v2 2) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/vendor/qcom/proprietary/mm-camera-titan 3) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/hardware/qcom/camera_titan 4) /home/cm/workspaces/Edgar/V06_1260/LINUX/android/vendor/qcom/proprietary/mm-still 5) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android 6) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android/hardware/qcom/camera_titan 7) /home/cm/workspaces/Edgar/V06_1260_55A/LINUX/android/vendor/qcom/proprietary ~ $ ecd -7
  • 17. ESSENTIAL COMMANDS hist - sort out cached history in shell and .bash_history provide a visible view with command history in both memory and .bash_history not broken the bash’s command history but extend it compatible to the exclamation mark (!) in bash
  • 18. ESSENTIAL COMMANDS Usage For any working directory, using following command to push it into list just pass the number after exclamation mark ~ $ hist|grep <keyword> ~ $ !<Number>
  • 19. ESSENTIAL COMMANDS ~ $ hist|grep fastboot
 220) adb shell logcat -v threadtime > ./log.txt 314) adb reboot bootloader && fastboot -i 0x27F1 flash boot /Volumes/Sanctuary/Ferry/V06_1260/LINUX/ android/out/target/product/v06/boot.img && fastboot -i 0x27F1 flash system /Volumes/Sanctuary/Ferry/ V06_1260/LINUX/android/out/target/product/v06/system.img && xfastflash reboot 317) adb shell setprop log.tag.ImageReaderTest VERBOSE 320) adb pull /storage/emulated/0/3840x2160_full_jpeg.jpg 321) adb pull /storage/emulated/0/3840x2160_full_yuv.jpg 368) adb shell logcat -v threadtime|grep "left =" ~ $ !314
  • 20. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 21. GTAGS - GNU GLOBAL source code tagging system support 6 PLs by default, 25 PLs with Exuberant Ctags plug-in parser. Java/C/C++ are default ones. Support shell command line,Vi, Emacs Performance! support text pattern …etc https://www.gnu.org/software/global/ for details… GET SYMBOLS IN A SECOND
  • 22. GET SYMBOLS IN A SECOND Preparation Download Install gtags make and install ~ $ wget http://tamacom.com/global/global-6.5.1.tar.gz ~ $ tar zxvf global-6.5.1.tar.gz && cd global-6.5.1 ~ $ ./configure && make && mkaeinstall
  • 23. GET SYMBOLS IN A SECOND Use gtags for Android codebase switch to Android source tree generate list of file to be indexed (optional) android_src $ find . ( ! -path "./out*" -a ! -name ".git*" ) -a ( - name "*.cpp" -o -name "*.h" -o -name "*.c" -o -name "*.aidl" -o - name "*.java" -o -name "*.S" ) > somefile ~ user$ cd <Android_source_tree>
  • 24. GET SYMBOLS IN A SECOND Index tags for Android codebase Index the source tree Update the source tree (when needed) android_src $ gtags -f somefile android_src $ global -uv
  • 25. GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query a symbol android_src $ global PowerManagerService frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
  • 26. GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query a symbol, have more info android_src $ global -x PowerManagerService PowerManagerService 102 ../../../../../frameworks/base/services/core/java/com/android/ server/power/PowerManagerService.java public final class PowerManagerService extends SystemService
  • 27. GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query WHO use a symbol android_src $ global -r PowerManagerService frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java frameworks/base/services/java/com/android/server/SystemServer.java
  • 28. GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query WHO use a symbol, with more info android_src $ global -rx PowerManagerService PowerManagerService 2998 frameworks/base/services/core/java/com/android/server/power/ PowerManagerService.java PowerManagerService.this.handleWakeLockDeath(this); PowerManagerService 53 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java import com.android.server.power.PowerManagerService; PowerManagerService 622 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java PowerManagerService.lowLevelReboot(reason); PowerManagerService 644 frameworks/base/services/core/java/com/android/server/power/ ShutdownThread.java PowerManagerService.lowLevelShutdown(); …
  • 29. GET SYMBOLS IN A SECOND Use gtags for indexed Android codebase query symbol support patterns (regular expression!) android_src $ global PowerManager* cts/tests/tests/os/src/android/os/cts/PowerManagerTest.java cts/tests/tests/os/src/android/os/cts/PowerManager_WakeLockTest.java … Caution! This takes minutes! But still much faster than search full codebase..
  • 30. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 31. Vim/Vi - native supports on tabs NerdTree - explore filesystem and to open files and directories forVi/Vim Tagbar - list symbols of current file forVi/Vim This depends on Exuberant ctags TABBED EDITOR WITH FS NAVIGATOR AND LIST OF SYMBOLS android_src $ sudo apt-get install exuberant-ctags Linux android_src $ brew install exuberant-ctags Mac
  • 32. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 33. GTAGS - GNU GLOBAL source code tagging system Although gtags support much editors, but it is not good enough! Only jump to symbol(callee) supported by gtags… TRIVIAL WAYTOTRACE SYMBOLS
  • 35. ajch’s gtags.vim - Alfred’s gtags plugin formVi/Vim we’re all vimers!! support get the list callers of symbols! the last pulse of code tracing! TRIVIAL WAYTOTRACE SYMBOLS
  • 36. TRIVIAL WAYTOTRACE SYMBOLS Having list of caller and callee is not enough We must have next page/prev page function too.
  • 37. ajch’s mym.vim - stack behaviours of the gtags operations onVi/Vim Hooray! we’re all vimers!! support next page/prev page operations makesVi/Vim be a browser like editor! Alfred’s plugins are integrated to ourVimSuite - later on.. TRIVIAL WAYTOTRACE SYMBOLS
  • 38. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 39. QFEnter - A vim plugin for intuitive file opening from Quickfix window to tabs THE EDITOR CAN SUPPORT QUERIES ON SYMBOLS WITHTABS
  • 40. vim-bookmarks - A vim plugin for bookmark support line based bookmark support bookmark annotations ease of use integrated to quick fix window … THE EDITOR WILL BE NICE IF IT HAS BOOKMARK ABILITIES
  • 41. EHFANDROIDVIMSUITE F2 - open/close/update bookmark F7 F8 F5 - next tab F6 - prev tab t
  • 42. EHFANDROIDVIMSUITE F3 - list of defines F4 - list of references
  • 43. WANTED Easy, Simple & one hop switching between working folders & commands Know the position of any symbol in a second Trivial way to trace symbols with their caller and callee Tabbed editor with FS navigator and list of symbols The editor can support queries on symbols with tabs The editor will be nice if it has bookmark abilities
  • 44. It is not enough It can be better
  • 45. WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
  • 46. xvim - put you to the symbol withVi/Vim directly based on gtags. ease of use list all candidates to choose first great partner to debug with logs!!!! RANDOM ACCESSTO CODEBASE
  • 47. RANDOM ACCESSTO CODEBASE 10-09 08:46:54.239 7427 7427 E mm-camera: mct: mct_pipeline_stop_session - E 10-09 08:46:54.240 7427 7427 E mm-camera: mct: mct_pipeline_process_set:command=800000b 10-09 08:46:54.240 7427 7427 E mm-camera: mct: mct_pipeline_process_set: Issuing DEL_STREAM on stream 0x1000f and stream type=10 10-09 08:46:54.240 7427 7427 I mm-camera-sensor: port_sensor_unlink_func:293ide 1000f 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_ext_unlink_func: E, identity = 0x1000f, port = 0xf4878e20, direction = 2 10-09 08:46:54.240 7427 7427 I mm-camera-sensor: port_sensor_caps_unreserve:204ide 1000f 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_check_caps_unreserve_func: E, identity = 0x1000f, port = 0xf4878e20, direction = 2 10-09 08:46:54.240 7427 7427 E mm-camera: iface_unreserve_sink_port: stream_id f mode 0 10-09 08:46:54.240 7427 7427 E mm-camera: port_iface_ext_unlink_func: E, identity = 0x1000f, port = 0xf4bbc160, direction = 1 10-09 08:46:54.240 7427 7427 E mm-camera: iface_ext_unlink_src_port: mct stream already removed from hw stream
  • 48. RANDOM ACCESSTO CODEBASE java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787) at java.util.HashMap$EntryIterator.next(HashMap.java:824) at java.util.HashMap$EntryIterator.next(HashMap.java:822) at com.android.internal.telephony.SubscriptionController.getPhoneId(SubscriptionController.java:1199) at com.android.phone.PhoneInterfaceManager.getPhone(PhoneInterfaceManager.java:789) at com.android.phone.PhoneInterfaceManager.getIccId(PhoneInterfaceManager.java:2161) at com.android.phone.PhoneInterfaceManager.getLine1NumberForDisplay(PhoneInterfaceManager.java:2205) …
  • 49. drop you to the symbol directly! RANDOM ACCESSTO CODEBASE android_src $ xvim <symbol_name> android_src $ xvim port_iface_check_caps_unreserve_func Example android_src $ xvim getPhoneId
  • 50. RANDOM ACCESSTO CODEBASE android_src $ xvim getPhoneId
 1) frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/MSimSignalClusterView.java: 378 2) frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/policy/ MSimNetworkControllerImpl.java:280 3) frameworks/base/telephony/java/android/telephony/RadioAccessFamily.java:75 4) frameworks/base/telephony/java/android/telephony/SubscriptionManager.java:828 5) frameworks/opt/telephony/src/java/com/android/internal/telephony/Phone.java:1999 6) frameworks/opt/telephony/src/java/com/android/internal/telephony/PhoneBase.java:2203 7) frameworks/opt/telephony/src/java/com/android/internal/telephony/PhoneProxy.java:1470 8) frameworks/opt/telephony/src/java/com/android/internal/telephony/ServiceStateTracker.java:1101 9) frameworks/opt/telephony/src/java/com/android/internal/telephony/SubscriptionController.java:1169 … #?
  • 51. WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
  • 52. The problem… comments for jira header/footer really a bullshit when code changes in 4+ files… comments for jira header/footer, this is penalty to RD, it discourage RD to do changes to solve the problem! DUPE AND REPEATED WORKS CAN BE MAXIMUM ELIMINATED
  • 53. git xcommit - unlock you from jira comment blocks.. auto comment jira header/fooder surround changed code block interactive way to input jira info for git-commits. auto list changed files for git add and commit msg. DUPE AND REPEATED WORKS CAN BE MAXIMUM ELIMINATED
  • 54. PREFERRED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
  • 55. The problem…. DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ mm project_XX $ cd ../../../../../../out/target/prodcut/V99 V99 $ adb push system/…. /system/…. V99 $ cd - project_XX $ mm
  • 56. reinstallSomething.py auto delivery .apk, .so, .xml, executable binaries to device with give name support pattern search accurate, reliable, and support both local and remote repositories DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION
  • 57. DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ mm … Install: out/target/product/v06/system/lib/hw/camera.msm8994.so … Install: out/target/product/v06/system/lib/libmmcamera_interface.so … Install: out/target/product/v06/system/lib/libmm-qcamera.so ….. ….. project_XX $ adb root project_XX $ adb remount project_XX $ reinstallSomething.py -i camera.msm8994.so libmmcamera_interface.so libmm-qcamera.so project_XX$ adb reboot
  • 58. pattern support Support remote repository DEPLOYMENT HAVE QUICK, ACCURATE,AND EASY SOLUTION project_XX $ reinstallSomething.py -i libmmcamera* local_dir $ export OUT_OVERLAY=/Volumes/Sanctuary/Ferry/V06_1260/LINUX/android/out/target/ product/v06 local_dir $ reinstallSomething.py -I libmmcamera* local_dir $ adb reboot
  • 59. WANTED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
  • 60. Problem.. the patch is good… but sometimes not applicable how to have full picture of changes how to deliver the change to other guys with full contexts … A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS
  • 61. git xcommit -backup This command will backup modified things (note, new added one must be separately handled, doesn’t a matter) A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS folder_to_backup $ git xcommit -backup
  • 62. A SECURE AND SAFE WAYTO BACKUP/ SAVE OUR WORKS WITHTRIALS
  • 63. PREFERRED II Random access to codebase Not only know the position of symbol, but put editor to the line directly Dupe and Repeated works can be maximum eliminated Deployment have quick, accurate, and easy solution A secure and safe way to backup/save our works with trials More & more…
  • 64. xfastboot, xadb… when multiple connected to host…… MORE & MORE… user $ xadb shell more than 1 devices, choose 1 device: 1) V06001325 2) V06000136 3) V06001835 4) V06000137 #? 1 V06001325 root@v06:/ #